- Omicron Andromedae
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ο Andromedae A 
Location of ο Andromedae (far right).Observation data
Epoch J2000 Equinox J2000Constellation Andromeda Right ascension 23h 01m 55.2643s Declination +42° 19' 33.525"' Apparent magnitude (V) 3.633 / 3.6 Characteristics Spectral type B6IIIep U−B color index -0.53 B−V color index -0.09 Variable type Eclipsing binary of beta Lyr Astrometry Radial velocity (Rv) -14.0 km/s Proper motion (μ) RA: 22.47 mas/yr
Dec.: 0.24 mas/yrParallax (π) 4.71 ± 0.67 mas Distance approx. 690 ly
(approx. 210 pc)Absolute magnitude (MV) 3.552 Other designations Database references SIMBAD data Omicron Andromedae (ο And, ο Andromedae) is a star system in the constellation Andromeda. It is approximately 692 light years from Earth.
Omicron Andromedae is a binary star, whose two components are both spectroscopic binaries themselves, making a four-star system. The system as a whole is classified as a blue-white B-type giant with a mean combined apparent magnitude of +3.62.
The separation of the two brightest components, ο Andromedae A and ο Andromedae B, is 0.34 arcseconds. They have an orbital period of 68.6 years. A is separated from its spectroscopic companion by 0.05 arcseconds. A is a Gamma Cassiopeiae type variable star and the system's brightness varies from magnitude +3.58 to +3.78. This, in turn, has made determination the orbital period of A's spectroscopic binary difficult. B's spectroscopic companion was discovered in 1989, and that binary has a period of 33.01 years.
References
Bayer Flamsteed 1 (ο) • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 (λ) • 17 (ι) • 18 • 19 (κ) • 20 (ψ) • 21 (α, Alpheratz) • 22 • 23 • 24 (θ) • 25 (σ) • 26 • 27 (ρ) • 28 • 29 (π) • 30 (ε) • 31 (δ) • 32 • 34 (ζ) • 35 (ν) • 36 • 37 (μ) • 38 (η) • 39 • 41 • 42 (φ) • 43 (β, Mirach) • 44 • 45 • 46 (ξ, Adhil) • 47 • 48 (ω) • 49 (A) • 50 (υ) • 51 • 52 (χ) • 53 (τ) • 55 • 56 • 57 (γ, Almach) • 58 • 59 • 60 (b) • 62 (c) • 63 • 64 • 65 • 66 • 6 PerNearby HH (Ross 248) • GX/GQ (Groombridge 34) • GJ 1289List Categories:- Giant star stubs
- Multiple star stubs
- Variable star stubs
- Andromeda constellation
- Bayer objects
- B-type giants
- Beta Lyrae variables
- Flamsteed objects
- Multiple star systems
- Spectroscopic binaries
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